多台计算机及终端设备通信线路互相连接起来,实现信息交换的网络,简称计算机通信网。计算机通信网是计算机(包括终端网络)与通信相结合而形成的网络,其目的是在计算机与计算机、计算机与终端间实现信息交换,以达到某些具体目标。首先是实现资源共享,例如,共享计算机的外部设备、数据库和程序库等;其次可以实现分布处理和系统间互为备用,从而提高系统的利用率和可靠性。此外,计算机通信网还 Multiple computers and terminal equipment communication lines connected to each other to achieve the exchange of information networks, referred to as computer communication network. Computer communication network is a network formed by the combination of computer (including terminal network) and communication. The purpose of computer communication network is to realize the exchange of information between computer and computer, computer and terminal to achieve some specific goals. The first is to achieve resource sharing, for example, to share the computer’s external devices, databases and libraries, etc .; secondly, to achieve distributed processing and system backup each other to improve system utilization and reliability. In addition, the computer communication network also